Wizards last a LOT longer in our games than Monks, Figthers and Paladins do. Bladesingers are the most survivable characters I've seen except maybe some corner-case Barbarians, and even rear guard Wizards that get wrapped up in melee usually don't take enough damage to go down because of shield, absorb elements, false life, contingency and similar spells.
Monks, Fighters and Paladins are the guys that go down the most IME, followed by Rangers, then Warlocks, then Rogues.
Clerics, Druids, Wizards, Barbarians and Sorcerers tend the last the longest, Barbarians because of the damage Reduction that comes with Rage, Clerics due to Death Ward, Druids because of shapeshifting, Wizards and Sorcerers due to the aforementioned spells.
Having more hps is always better, but Constitution does not give enough for a few more points to matter a whole lot IME.